Research On Design And Test Method Of Power Mechanism Simulation System

After entering the 21 st century, as human's understanding and transforming of nature is more and more deep, aerospace technology has become one of the world's most influential frontier areas. The level of the craft technology of a nation represents its overall level of aviation and aerospace field. The power source of rockets, missiles and airplanes mainly comes from the engine. In order to make the craft have a good maneuverability, the engine usually has a thrust vector control system. In order to ensure the control accuracy of the aircrafts' attitude, we must ensure the control precision of the engine's thrust vector.In order to test the control performance of the thrust vector mechanism, which is used to control the nozzle in the tail of the aircraft's power equipment, based on the real structure of the swing nozzle of the aircraft' engine, the paper studied the design method of the simulation platform used for test, and the attitude angle test method of the simulation platform. The simulation platform used for test can completely simulate the motion of real nozzle. The system has high precision of attitude angle measurement, board versatility and high scalability.The main research contents and work of the paper are as follows:The paper presents the hardware structure of the simulation platform. For the core mechanical parts of the system, the ball joint and the simulated nozzle, the paper gives the design and check method. After verified, the structure designed fulfills the functions of the system. Then we illustrate the hardware used to measure the attitude angle, and give the type selection and design method of dual-axis angle sensor, which is used as the sensitive element in the angle measurement subsystem, and also of the light source and position sensitive device of the position tracking subsystem.The paper constructs an open control system on the basis of IPC and PMAC, which completes the motion controlling tasks of the displacement tracking. PMAC is responsible for sending the movement instruction directly, to realize the direct control of the executive structure. While PC is responsible for management of the interface of the upper computer and some related parameters. Then the paper introduced the speed control mode base on PMAC, and the debugging process of the system.On the basis of the test simulation platform, the paper research on the attitude angle test method of the simulation platform. This paper introduces the principle of measurement, which combines the displacement tracking subsystem and the angle measurement subsystem. And then we give a detailed explanation of the two subsystems.Finally, the paper studies the system error of the simulation platform in measuring the attitude angle. As to the problem that the sensitive axes of the angle measuring subsystem are hard to keep parallel with the axes of the system, an error model is established and then an error calibration method is proposed. As to position sensitive device, the two-dimensional displacement tracking platform and the laser in the displacement tracking subsystem, errors are analyzed. At last, the whole test process of the power mechanism simulation system is put forward.